import authres only provides the RFC 5451 types. Individual additions can be
imported by name, import authres.dkim_b, authres.dkim_adsp, authres.vbr,
authres.dmarc. To use all the features, the feature context
authres.all_features() is provided.

Header folding and unfolding is the responsibility of the calling application.

Between docstrings and RFC 5451 the API should be reasonably clear, but the
docstrings are still a work in progress. Additional examples are available in
the file authres/tests. The API is completely reworked from version 0.1.

This package requires python2.6 or later (including python3). It has been
tested with python2.6, python2.7, python3.2, and python3.3.

To execute doctests, run the module as main: python -m authres.__main__